I have a 1st gen unibody MacBook, about 15 months old. It's spent almost its entire life plugged in, but with occasional excursions away from power for the day.

I have a 1st gen unibody MacBook, about 15 months old. It's spent almost its entire life plugged in, but with occasional excursions away from power for the day. These are the figures iStat gives me for the battery at the moment: 100% Health and 133 cycles. It still gives me 5+ hours battery life, enough to mean I don't usually take the power cord with me.